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參數資料
| 型號： | NBC12439 |
| 廠商： | ON SEMICONDUCTOR |
| 英文描述： | 3.3V/5V Programmable PLL Synthesized Clock Generator(3.3V/5V可編程PLL合成時鐘發生器) |
| 中文描述： | 3.3V/5V的可編程鎖相環路合成時鐘發生器（3.3V/5V的可編程PLL頻率合成時鐘發生器） |
| 文件頁數： | 11/20頁 |
| 文件大小： | 208K |
| 代理商： | NBC12439 |
NBC12439, NBC12439A
http://onsemi.com
11
Most of the signals available on the TEST output pin are
useful only for performance verification of the device itself.
However, the PLL bypass mode may be of interest at the
board level for functional debug. When T[2:0] is set to 110,
the device is placed in PLL bypass mode. In this mode the
S_CLOCK input is fed directly into the M and N dividers.
The N divider drives the FOUT differential pair and the M
counter drives the TEST output pin. In this mode the
S_CLOCK input could be used for low speed board level
functional test or debug. Bypassing the PLL and driving
FOUT directly gives the user more control on the test clocks
sent through the clock tree. Figure 7 shows the functional
setup of the PLL bypass mode. Because the S_CLOCK is a
CMOS level the input frequency is limited to 250 MHz or
less. This means the fastest the FOUT pin can be toggled via
the S_CLOCK is 250 MHz as the minimum divide ratio of
the N counter is 1. Note that the M counter output on the
TEST output will not be a 50% duty cycle due to the way the
divider is implemented.
T2
T1
T0
TEST OUTPUT
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
SHIFT REGISTER OUT
HIGH
FREF
M COUNTER OUT
FOUT
LOW
PLL BYPASS
FOUT
4
Figure 5. Parallel Interface Timing Diagram
M[6:0]
N[1:0]
P_LOAD
éééé
éééé
ééééé
ééééé
t
h
M, N to P_LOAD
VALID
s
Figure 6. Serial Interface Timing Diagram
S_CLOCK
S_DATA
S_LOAD
Last
Bit
C1
C2
t
h
C3
S_DATA to S_CLOCK
C4
C5
C6
C7
C8
C9
C10
C11
C12
T2
T1
T0
N1
N0
M6
M5
M4
M3
M2
M1
M0
First
Bit
t
s
t
s
t
h
S_CLOCK to S_LOAD
Figure 7. Serial Test Clock Block Diagram
T2=T1=1, T0=0: Test Mode
SCLOCK is selected, MCNT is on TEST output, SCLOCK
PLOAD acts as reset for test pin latch. When latch reset, T2 data is shifted out TEST pin.
N is on FOUT pin.
FDIV4
MCNT
LOW
F
OUT
MCNT
FREF
HIGH
TEST
MUX
7
0
TEST
F
OUT
(VIA ENABLE GATE)
N
(1, 2, 4, 8)
0
1
PLL 12430
LATCH
Reset
PLOAD
M COUNTER
SLOAD
T0
T1
T2
VCO_CLK
SHIFT
REG
14-BIT
DECODE
SDATA
SCLOCK
MCNT
FREF_EXT
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| NBSG11BAR2 | 2.5V/3.3VSiGe 1:2 Differential Clock Driver with RSECL* Outputs |
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相關代理商/技術參數 |
參數描述 |
|---|---|
| NBC12439/D | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:3.3V / 5V Programmable PLL Synthesized Clock Generator with Power Down (50 to 800MHz) |
| NBC12439_07 | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:3.3V/5V Programmable PLL Synthesized Clock Generator |
| NBC12439A | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:3.3V/5V Programmable PLL Synthesized Clock Generator |
| NBC12439AFA | 功能描述:時鐘發生器及支持產品 3.3V/5V Programmable RoHS:否 制造商:Silicon Labs 類型:Clock Generators 最大輸入頻率:14.318 MHz 最大輸出頻率:166 MHz 輸出端數量:16 占空比 - 最大:55 % 工作電源電壓:3.3 V 工作電源電流:1 mA 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:QFN-56 |
| NBC12439AFAG | 功能描述:鎖相環 - PLL 3.3V/5V Programmable PLL Clock Generator RoHS:否 制造商:Silicon Labs 類型:PLL Clock Multiplier 電路數量:1 最大輸入頻率:710 MHz 最小輸入頻率:0.002 MHz 輸出頻率范圍:0.002 MHz to 808 MHz 電源電壓-最大:3.63 V 電源電壓-最小:1.71 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:QFN-36 封裝:Tray |
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